Acoustic apparatus.



No. 666,l98. Patented Jan. 15, IQOI.

H. KUTH.

ACOUSTIC APPARATUS. (Applicstion fllod Apr. 0, 1900.)

(No Iodel.)

m: NORRIS nz'rzns co. PHOTO-LITHQ. WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

HERMANN KUTH, OF BERLIN, GERMANY.

ACOUSTIC APPARATUS.

IYEGIFIOATION forming part of Letters Patent No. 666,198, dated January15, 1901.

Application filed April 9, 1900.

To (til whont it may concern:

Be it known that I, HERMANN KUTH, manufacturer, residing at Berlin, inthe Empire of Germany, have invented Improvements in Acoustic Apparatusfor Conducting Sound to the Ear, of which the following is aspecification.

The acoustic apparatus according to this invention is so contrived thatit can be worn on the back of the head without falling out and the soundbe intercepted on both sides, as well as at the front and the back, andconveyed to the ear.

The invention is illustrated in the accompanying drawings.

Figure 1 is a front View; Fig. 2, an under side plan, and Fig. 3 avertical circular section along the line A B in Fig. 2.

The apparatus consists of a smooth arched frame with a front a, back I),and narrow bottom plate 0. The parts a, b, and c are so formed and bentthat the frame fits as nearly as possible to the back of the head. Atthe same time a smalljunction-tube dis attached, onto which the flexibleauricular tube 6, which leads to the ear, is pushed. The interior of theframe is divided by means of partitions f into several sectors orfunnel-like soundingchambers g. The partitions f extend nearly to thejunction-tube d, so that all the chambers are separated as much aspossible from one another, but are in connection with the junction-tubeand the auricular tube 6. The souriding-chambers 9 open out above or atthe side. The side sou riding-chambers serve for intercepting thesound-waves coming from the front and the side, while one or morecentral sounding-chambers receive the soundwaves coming from the back.In order that the sound may be better intercepted, one of the two upperedges of the sounding-chambers g is allowed to project somewhat moreSerial No. 12,185. (No model.)

than the other. The side sounding-chambers have an extra high back h,which intercepts the sound-waves coming from the front and the side andconducts them farther. On the other hand the central sounding-chambershave an extra high front 1', which intercepts the sound-waves comingfrom behind and carries them onward. The number of soundchambers isoptional. In the example shown in the drawings fourare arranged. Thenumber may, however, be larger or smaller. In certain circumstances asingle soundingchamber is suificient.

The apparatus is put on the back of the head in the manner of a wig andfastened thereto in a suitable manner. It may be made of the lightestpossible material or of other material.

The back or side of the apparatus is suitably covered with hair in thestyle of a Wig or painted so as to resemble hair.

Having now particularly described and ascertainedthe nature of my saidinvention and in what manner the same is to be performed, I declare thatWhat I claim is- An ear-trumpet consisting of a curved anriculate bodyportion or frame conforming substantially to the shape of the back ofthe head and interiorly divided into a series of flaring sound passagesor chambers g, separated from one another for substantially their entirelength by partitions f, said chambers converging toward and uniting at acommon point, a connecting-tube d, and a flexible auricular tube 6, forthe same, substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

HERMANN KUTH.

Witnesses:

HENRY HAsPER, WOLDEMAR HAUPT.

